Automatic saw-sharpening machine.



Patented Feb. I2, I90I. w. G. B HL. AUTOMATIC SAW SHABPENING 'MACHINE (Application'led Oct. 5, 1900.) (I'Io Modal.)

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SECIFICATJN forming part of Letters Patent No. 668,089, dated February 12, 1901.

Application filed October 5, 1900. aerial No. 32,094. (No model.)

le it known that I, WILHELM GOTTLIEB IHL, a subject of His Majesty the Emperor of Germany, residing at I-Iaspelerstrasse l, in the city of Barmen, in the Province of Rhenish Prussia, Germany, have invented a new and useful Improvement in Automatic Saw- Sharpening Machines, of which the following is a full, clear7 and exact specification, such as will enable others skilled in the art of such machines to make and use the same.

fdy invention has for its object an automatic machine by which belt-saws are sharpened with sai\'-files, the manner in which such file is fastened and moved forming one important part of my invention and the construction of the mechanism for transporting the saw being a further improvement, so that by both coiistructions, which are closely connet-ted together, as will hereinafter be seen, a sharpening-machine is produced which is simple in construction but effective in working.

In the accompanying drawings, Figure 1 is a top view of the complete machine; Fig. 2, a face view of the same; Fig. 3, a vertical section along line d (t of Fig. 1; Fig. 4, a vertical section along line b h of Fig. 1.

Like numerals of reference are used to designate like parts in the drawings.

1 is the framework or bed of the machine, from which extends vertically upward a bracket 2, in which is jou rnaled a shaft 3, to the rear end of which are fitted a fixed and a loose pulley 4t 5. The other end of said shaft carries a crank-disk 6. In a right angle to the bracket 2 on the bed 1 of the machine are arranged two brackets 7, in which a round bar S is fitted so that it can turn therein. The space between said brackets is engaged by the hub of a down ward-directed arm 9, Which surrounds said bar 3 and which is fastened upon the bar 3. On the latter are arranged 'two arms 10, which may be moved on said bar and also rocked therewith. Between the ends of these arms is secured the saw-file 11 by means of a screw 12. Both arms are held rigidly in position by a rod 13, ruiming parallel to bar S through the lever 9 and both arms, and being fixed to the inner one by a set-screw le and to the outer one by the nuts 15. The inner arm is embraced by a fork 16, from which leads a connecting-rod 17 to the crank-bolt 18, and it will now be understood that by the said means the file will be moved in longitudinal direction in order to sharpen the saw 19. The latter is supported by adjustable bolts 20 and held firmly in position or stilfened, respectively, by a vise 2l of any known construction.

In both end positions of the file-stroke the same is moved sidewise, the brackets 7 forming the fulcrum for the rocking movement. This movement will be obtained bya projection 22, fitted on the crank-disk 6, Which actuates at the proper moment-that is, when the file has finished its stroke-on an antifriction-roller 23, pivoted to the lever 9, and causes it to turn. By means of rod 13 arms 10 are, together with bar 8, turned and the file removed from the saw. The turning of bar S has caused also a stretch of a coiled spring 24, fixed with one end to the bracket 7 and with the other end to a ring 25, seated on the end of bar 3. At the beginning of its stroke the file is forced down into the saw by said spring being stretched in the described 'IYhe means for feeding the saw may be understood from the following: In suitable bearings 26 of bed 1 is guided a shaft 27, to the front end of which is keyed an arm 28, which carries on its head a pawl 29, which may be adjustable by a screw and which engages the saw. To the head of said arm is pivoted a second pawl 30, which comes in action when a tooth in the saw is lacking, and the first pawl can therefore alone not feed the saw. The other end of shaft 27 is fitted with a lever 31, having a slanted end upon which actuates an antifriction-roller 32, so that, together with the lifting of the saw-file, arm 31 is forced down and the saw fed forward. A spring 33 is arranged to push arm 31 back in its normal position, While a set screw 34: serves to adj ustthe feeding stroke.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a saw-sharpening machine the combination of a saw supporting and holding device of a revolved crank-disk with a horizontal bar, arms adapted to slide thereon and hold the le, of a rocking lever fixed to said bar and actuated by said disk and of a rod connecting said lever and said bars, of a IOO Q espee spring fitted to the rear of said bar for the a slanted end and a. roller forming part of purpose described and set forth. the lever-arm lMld an adjusting-screw 34 for 2. In a sew-sharpening machine the oomthe purpose described and set forth.

hina-tion of a saw-supporting device, a re- WILHELM GOTTLIEB BHL. 5 voived crank-disk and a horizontally-guided Witnesses:

bar, a. lever-arm fixed thereto, of a shaft ear- OTTO KNIG,

rying an arm With two pawls and an arm with T. A. RITTERSHAUS. 

